Webanwendungen mit der MVC API und Eclipse Krazo

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3. FacesServlet
   

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7. - Vorteil: Nutzung der HTTP Semantik (z.B. Verben) möglich
   - Implementierungen müssen Adapter für JSP und JSF bereitstellen
   −
   −
   

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9. plugins {
   id 'java'
   id 'war'
   }
   repositories {
   jcenter()
   mavenCentral()
   }
   dependencies {
   //…
   implementation 'javax.mvc:javax.mvc-api:1.0.0‘
   implementation 'org.eclipse.krazo:krazo-resteasy:1.0.0‘
   // implementation 'org.eclipse.krazo.ext:krazo-thymeleaf:1.0.0'
   providedCompile 'jakarta.platform:jakarta.jakartaee-web-api:8.0.0'
   //…
   }
   

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11. import javax.ws.rs.ApplicationPath;
    import javax.ws.rs.core.Application;
    @ApplicationPath("/mvc")
    public class App extends Application {
    }
    

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12. 
    
    
    
    Hello World
    
    
    Hello World!
    
    
    import javax.mvc.Controller;
    import javax.ws.rs.GET;
    import javax.ws.rs.Path;
    @Path("hello")
    @Controller
    public class
    HelloWorldController {
    @GET
    public String sayHello() {
    return "hello.jsp";
    }
    }
    

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15. @Path("/bookings")
    @Controller
    public class BookingController {
    // ...
    @Inject
    private Models models;
    @GET
    public String index() {
    final var bookings = bookingService.getAllBookings();
    models.put("bookings", bookings);
    return "index.jsp";
    }
    // ...
    

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16. @Path("/bookings")
    @Controller
    public class BookingController {
    // ...
    @Inject
    private Models models;
    @GET
    public String showIndex() {
    // ...
    models.put("bookings", bookings);
    return "index.jsp";
    }
    // ...
    }
    
    
    ${booking.bookingNumber}
    ${booking.name}
    …
    
    

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17. @Path("/bookings")
    @Controller
    public class BookingController {
    // ...
    @Inject
    private Models models;
    @GET
    public String showIndex() {
    final var bookings =
    bookingService.getAllBookings();
    models.put("bookings", bookings);
    return "index.jsp";
    }
    // ...
    }
    

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18. @Inject
    private Models models;
    
    
    ${booking.bookingNumber}
    ${booking.name}
    …
    
    @Path("/bookings")
    @Controller
    public class BookingController {
    // ...
    @Inject
    private Models models;
    @GET
    public String showIndex() {
    // ...
    return "index.jsp";
    }
    // ...
    }
    

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20. @Path("/bookings")
    @Controller
    public class BookingController {
    // ...
    @GET
    @Path("/{bookingNumber}")
    public Response showDetailsOfBooking(@PathParam("bookingNumber") final UUID bookingNumber) {
    final var booking = bookingService.findBookingForBookingNumber(bookingNumber);
    if (booking.isPresent()) {
    models.put("booking", booking.get());
    return Response.ok("details.jsp").build();
    } else {
    models.put("bookingNumber", bookingNumber);
    return Response.status(Response.Status.NOT_FOUND).entity("404.jsp").build();
    }
    }
    // ...
    

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21. @GET
    @Path("/{bookingNumber}")
    public Response showDetailsOfBooking(
    @PathParam("bookingNumber") final UUID bookingNumber) {
    // ...
    if (booking.isPresent()) {
    models.put("booking", booking.get());
    return Response.ok("details.jsp").build();
    } else {
    // ...
    }
    }
    

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22. @GET
    @Path("/{bookingNumber}")
    public Response showDetailsOfBooking(
    @PathParam("bookingNumber") final UUID bookingNumber) {
    // ...
    if (booking.isPresent()) {
    // ...
    } else {
    models.put("bookingNumber", bookingNumber);
    return Response
    .status(Response.Status.NOT_FOUND)
    .entity("404.jsp")
    .build();
    }
    }
    

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24. href="/bookings/${booking.bookingNumber}">
    Details
    
    

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25. href="/bookings/${booking.bookingNumber}">
    Details
    
    

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26. href="/bookings/${booking.bookingNumber}">
    Details
    
    

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27. href="${mvc.uriBuilder('BookingController#showDetailsOfBooking').build(booking.bookingNumber)}">
    Details
    
    

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28. href="${mvc.uriBuilder('BookingController#showDetailsOfBooking').build(booking.bookingNumber)}">
    Details
    
    @Path("/bookings")
    @Controller
    public class BookingController {
    // ...
    @GET
    @Path("/{bookingNumber}")
    public String showDetailsOfBooking(@PathParam("bookingNumber") final UUID bookingNumber) {
    // ...
    }
    // ...
    

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29. →
    
    Details
    
    

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30. href="${mvc.uriBuilder('showBookingDetails').build(booking.bookingNumber)}">Details
    
    @Path("/bookings")
    @Controller
    public class BookingController {
    // ...
    @GET
    @Path("/{bookingNumber}")
    @UriRef("showBookingDetails")
    public String showDetailsOfBooking(@PathParam("bookingNumber") final UUID bookingNumber) {
    // ...
    }
    // ...
    

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31. →
    
    Details
    
    

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33. @Path("/bookings")
    @Controller
    public class BookingController {
    // ...
    @GET
    @Path("/new")
    public String showNewBookingForm() {
    return "form.jsp";
    }
    // ...
    }
    

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34. 
    
    
    Name
    
    
    
    
    
    Save
    
    
    
    

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35. // ...
    @Inject private BindingResult bindingResult;
    @POST
    public String createNewBooking(@MvcBinding @FormParam("name")
    @NotBlank @Size(min = 5, max = 255) final String name) {
    if (bindingResult.isFailed()) {
    models.put("errors", new ArrayList<>(bindingResult.getAllErrors()));
    return "form.jsp";
    }
    final var booking = bookingService.createNewBooking(name);
    return "redirect:/bookings/" + booking.getBookingNumber();
    }
    // ...
    placeholder="Name of booking" required>
    

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36. 
    
    
    ${msg.get("form.label.name")}
    
    
    
    
    
    
    
    
    ${error.getParamName()}: ${error.getMessage()}
    
    
    
    
    
    
    
    ${msg.get("form.btn.save")}
    
    
    
    

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38. •
    •
    

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39. 
    
    
    Name
    
    
    
    
    
    Save
    
    
    
    

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43. 
    
    
    Name
    
    
    
    
    
    
    Save
    
    
    
    

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44. @POST
    @CsrfProtected
    public String createNewBooking(@MvcBinding @FormParam("name")
    @NotBlank @Size(min = 5, max = 255) final String name) {
    // ...
    }
    

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46. // ...
    @DELETE
    @Path("/{bookingNumber}")
    public String cancelBooking(@PathParam("bookingNumber") final UUID bookingNumber) {
    final var isCancelled = bookingService.cancelBooking(bookingNumber);
    return isCancelled ? "redirect:/bookings" : "404.jsp";
    }
    // ...
    

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48. action="${mvc.uriBuilder('BookingController#cancelBooking').build(booking.bookingNumber)}"
    onsubmit="return confirm('Do you really want to cancel the booking?');">
    
    Cancel
    
    

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50. /**
    * Locale resolvers are used to determine the locale of the current request and are
    * discovered using CDI.
    *
    *
    * …
    */
    public interface LocaleResolver {
    /**
    * Resolve the locale of the current request given a {@linkLocaleResolverContext}.
    *
    * …
    *
    * @param context the context needed for processing.
    * @return The resolved locale or null.
    */
    Locale resolveLocale(LocaleResolverContext context);
    }
    

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51. /**
    * Locale resolvers are used to determine the locale of the current request and are
    * discovered using CDI.
    *
    *
    * …
    */
    public interface LocaleResolver {
    /**
    * Resolve the locale of the current request given a {@linkLocaleResolverContext}.
    *
    * …
    *
    * @param context the context needed for processing.
    * @return The resolved locale or null.
    */
    Locale resolveLocale(LocaleResolverContext context);
    }
    org.eclipse.krazo.locale.LocaleResolverChain
    MvcContext
    

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52. messages
    //messages.properties
    …
    #Index Page
    page.title=My awesome application
    #Hello World
    hello.world=Hello World!
    //messages_fr.properties
    #Hello World
    hello.world=Bonjour le monde!
    //messages_de.properties
    #Hello World
    hello.world=Hallo Welt!
    

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53. @RequestScoped
    @Named("msg")
    public class Messages {
    @Inject
    private MvcContext mvcContext;
    public final String get(final String key) {
    LOGGER.info(String.format("Getting message '%s' for locale '%s'", key,
    mvcContext.getLocale()));
    final var bundle = ResourceBundle.getBundle("messages", mvcContext.getLocale());
    return bundle.containsKey(key) ? bundle.getString(key) : formatUnknownKey(key);
    }
    private static String formatUnknownKey(final String key) {
    return String.format("???%s???", key);
    }
    }
    

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54. <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    
    
    
    ${msg.get("page.title")}
    
    
    ${msg.get("hello.world")}
    
    
    

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55. //messages.properties
    
    
    
    
    My awesome application
    
    
    
    
    Hello World!
    
    
    
    //messages_fr.properties
    
    
    
    
    My awesome application
    
    
    
    
    Bonjour le monde!
    
    
    
    //messages_de.properties
    
    
    
    
    My awesome application
    
    
    
    
    Hallo Welt!
    
    
    
    

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